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TRIR (or TRIF)
LTIR (or LTIF)
The Total Recordable Incidence Rate (TRIR) is a measure of the rate of recordable workplace injuries, normalized per 100 workers per year.
The factor is derived by multiplying the number of recordable injuries in a calendar year by 200,000 (100 employees working 2000 hours per year)
and dividing this value by the total man-hours actually worked in the year.

RECORDABLE CASES: Occupational death, nonfatal occupational illness,
and those nonfatal occupational injuries which involve one or more of the
following: loss of consciousness, restriction of work or motion, transfer to
another job, or medical treatment (other than first aid).
Lost-time injury frequency rates are the number of lost-time injuries within a given accounting period relative to the total number of hours worked in the same accounting period. This is calculated as follows and results in a measure of the number of lost-time injuries per hour worked during the accounting period:

( Number of lost time injuries in accounting period )
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( Total hours worked in accounting period )

See also:
  • m


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